The OpenStack Block Storage service (Cinder) adds persistent storage to a virtual machine. Block Storage provides an infrastructure for managing volumes, and interacts with OpenStack Compute to provide volumes for instances. The service also enables management of volume snapshots, and volume types.
The Block Storage service consists of the following components:
Accepts API requests, and routes them to the cinder-volume
for
action.
Interacts directly with the Block Storage service, and processes
such as the cinder-scheduler
. It also interacts with these processes
through a message queue. The cinder-volume
service responds to read
and write requests sent to the Block Storage service to maintain
state. It can interact with a variety of storage providers through a
driver architecture.
Selects the optimal storage provider node on which to create the
volume. A similar component to the nova-scheduler
.
The cinder-backup
service provides backing up volumes of any type to
a backup storage provider. Like the cinder-volume
service, it can
interact with a variety of storage providers through a driver
architecture.
Routes information between the Block Storage processes.
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